less·er o·men·tum

[TA]

a thin, double-layer peritoneal fold formed by the ventral mesentery of the stomach (ventral mesogastrium) passing from the lesser curvature of the stomach and upper border to the proximal duodenum (2 cm distal to the pylorus) to the liver (margins of the porta hepatis and into the depth of the fissure of the ductus venosus); major subcomponents include the hepatogastric ligament (main sheetlike portion) and the hepatoduodenal ligament (thickened free right border, which encloses the hepatic artery, portal vein, and common bile duct.

lesser omentum

n.

A fold of the peritoneum joining parts of the stomach and duodenum to the liver.

lesser omentum

Etymology: AS, losian, to lose; L, omentum, entrails

a membranous extension of the peritoneum from the peritoneal layers covering the ventral and the dorsal surfaces of the stomach and the first part of the duodenum. The lesser omentum extends from the portal fissure of the liver to the diaphragm, where the layers separate to enclose the end of the esophagus. It also forms two ligaments, one associated with the liver, the hepatogastric ligament, and the other, the hepatoduodenal ligament, with the duodenum. Also called gastrohepatic omentum,small omentum.

less·er o·men·tum

(les'ĕr ō-men'tŭm) [TA]

A peritoneal fold passing from the margins of the porta hepatis and the bottom of the fissure of the ductus venosus to the lesser curvature of the stomach and to the upper border of the duodenum for a distance of about 2 cm beyond the gastroduodenal pylorus.

omentum

pl. omenta [L.] a fold of peritoneum extending from the stomach to adjacent abdominal organs. Lace-like in pigs, carnivores and the horse, sheetlike in ruminants.

gastrocolic omentum

the part of the greater omentum attached to the colon.

gastrohepatic omentum

the part of the lesser omentum attached to the liver.

greater omentum

the double fold of peritoneum derived from the dorsal mesogastrium that extends from the greater curvature of the stomach over the floor of the abdomen like an apron; poorly developed in the horse and well developed in ruminants.

lesser omentum

a peritoneal fold joining the lesser curvature of the stomach and the first part of the duodenum to the porta hepatis.

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